Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2022
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 4,194	$ 3,990	$ 4,194
Impaired loans with a valuation allowance	4,663	8,634	4,663
Total impaired loans	8,857	12,624	8,857
Valuation allowance related to impaired loans	1,996	1,535	1,996
Total non-accrual loans	4,689	8,581	4,689
Total loans past-due ninety days or more and still accruing	0	0	0
Average investment in impaired loans	$ 9,660	$ 12,764	$ 10,710